Washington, Dec 30, 2020, SPA -- Local health officials in the western state of Colorado yesterday, on Tuesday announced the United States' first known case of a potentially more transmissible coronavirus variant spreading in Britain, Kyodo reported. A man in his 20s, who has no travel history, was confirmed to have contracted the virus variant and is recovering in isolation, the office of the state governor said in a press release. "The individual has no close contacts identified so far, but public health officials are working to identify other potential cases and contacts through thorough contact tracing interviews," it said. "There is a lot we don't know about this new COVID-19 variant, but scientists in the United Kingdom are warning the world that it is significantly more contagious," Gov. Jared Polis said, adding that authorities are working to contain the virus "at all levels." The announcement is another blow to a country that has already suffered the highest number of coronavirus cases and deaths in the world. --SPA 20:40 LOCAL TIME 17:40 GMT 0014 www.spa.gov.sa/w1476225